HP Compaq 621 Notebook Essential System Updates 4.1 for Windows XP
This package installs Microsoft fixes and enhancements for the Microsoft Windows XP Operating System, as well as providing other fixes and enhancements that are specific to ..

HP Compaq 621 Notebook System Default Settings 2.0.2.3 for Windows Vista
This package contains a program that enables users to restore the default Power Management Settings in the registry for the supported notebook models and operating sys..

HP Compaq 621 Notebook Essential System Updates 1.1 for Windows Vista
This package installs Microsoft fixes and enhancements for the Microsoft Windows Vista Operating System with Service Pack 2 (SP2), as well as providing other fixes and en..